Cutting, sawing, slotting, and similar apparatus



J. H. scHELL 1,829,679

CUTTING, SAWING, SLOTTING, AND SIMILAR APPARATUS Filed Feb. 2l, 1929 2 Sheets-Sheet l Oct. 27, 1931.

Inverzir.' J-Oan 2.7. S05/ew, 7

@auf @$36.

00L 27, 1931 J. H. scHELL 1,829,679

CUTTING, SAWING, SLOTTING, AND SIMILAR APPARATUS Filed Feb. 21, 1929 2 sheets-sheet 2 Patented Oct. 27, 1931L A JOHAN HENDRIK seimila, or ROTTERDAM, ITETHERLANDS a CUTTING, sAWING, sLoTTVING, AND SIMILAR. APPARATUS Application filed rebruary 21,19`a9. sei-'iai No, 341,785.

My invention relates to cutting apparatus andv has for vitsobj ect an apparatus of ygreat Y I 'capacity andadaptedto cut widely different .1naterials, more especially rubber, leather,

wood, linoleum, etc., but also adapted, when l fitted with a suitable tool ortools in place of the knife or knives, to be used for other oper-V ations such as sawing, slotting, etc.

'l/Vith this object in view, my novel apparatus comprises a shaft having an eccentric, thestrap of which is engaged in onepoint by a member mounted for reciprocation along a rectilinear or curved path, and in another point 'carries the knife Lor another tool.v Said. 175 apparatus is mounted on, or below, `atall Vevents on one side of the table or other rbase for supporting the'material to be cut or otherwise worked. l i Dependent upon the properties ofthe material to be cut or otherwise worked, it may be desirable for the length of stroke of the knife orothe-r tool to lbe varied. In accordg ancewith my present invention, this can be realized .by the provision o-f means Awhereby the eccentric can befadjusted in a simple manner. i 1

rI he drawings illustrate, by way of yeX- ample, two embodiments of my invention,

Y both fitted with one knife having an adjust- 30.V able lengthof stroke. f 1 Q Fig. 1 is a sectional view along the line I-'I in Fig. 2. f

Fig. 2 is a sectional view along the broken line Ill-ll in Figgl.

Fig. 3 is partly a sectional view, lpartly a side elevation of a manually operated appa- Fig. 4 is a Vcross section along the line IVe-IV in Fig.'3. Y. Fig. 5 is a rear elevational view .,fication. y f j y The apparatus illustarted in Figs. 1 andk 2 of la modicomprises a frame 1 with ball bearings 3, 4 for a shaft2 having an eccentric central. portion 5 Yenclosed by an eccentric sleeve 6 Aforming the bearing for a strap 7. Saidy strapv hasenf" 'j 1 larged portions or projections 8 and 9. The Y. l n enlarged portion 8 is engaged through a ballt 15G bearing 10 by a bifurcated rod 11 pivoted as `at 12 to the frame 1, whereas thefenlarged strap portion') ycarries the knife 13.

The shaft 2'isadapted to be driven by a motor through a belt pulley 14 keyed there-'f to. Theeccentric portion 5 of the shaften-` 55 gages sleeve 6 through pins 15 v'located in radial bore holes in said eccentric and in contact at their inward ends with a tapered rod 16,

which projects into an axial bore hole of shaft a 2l and is provided intermedia-te between its eo ends with screw thread cooperating with a female thread 17 on the inner wall of said bore hole. By means of a hand wheel 18 the rod 16 canv be screwed into or out of its hole,

whereby the Ypins y*15 vare forced outwards v 65 against the inner'wall vofsle'eve 6 so as to clamp the latter, or are released, respectively.

lVhcn'the pins15 are released'and, consequently, sleeveG is free to revolvefon the eccentric'portion 5, shaft 2k is yturn-ed until the l70 desiredecc'entricity has beenobtained.'L During this adjustment, sleeve 6 should be prevented' from following the rotation of :shaft 2, and forthis purpose a bolt 19, which is slidably mounted within a hole of the frame, isV adaptedto be shot into a. recess 2,0 of a ange 6a of said sleeve. c i V'l`h`e1knife13 projects through afslot 21 of atable 22whichserves to support the inatc- 'rial to be cut, said material being fed, by 80l hand or .by a feeding device not shown, in the direction of arrow 24. The very favorable action of knife 13 is to be attributed to the fact that during the cutting operation the direction of motion of said knife is continuously varied.

Obviously, the apparatus could be provided -with a plurality'of knives carried, for instance,.by a cross ,bar connecting two aXial` ly spaced eccentric straps. 1

Figs. 3 and 4 illustrate a manually operated cutting apparatus having the'same compact construction as has the apparatus shown in Figs. 1 and 2. 'In these figures, 24 is a casing provided with a handle 25 and enclosing a 95 .i .shaft 26 with an eccentric 27.` on which iis 1nounted,.through a ball race 28, a strap 29. Said straphas a radially projecting arm 30 guided through an antifriction roller 31 by the walls of a slotf32of casing 24, anda tan- ,100 

